NASA/GSFC Scanning Raman Lidar measurements of water vapor and clouds during IHOP David N. Whiteman/NASA-GSFC, Belay Demoz/UMBC Paolo Di Girolamo/Univ. of Basilicata, Igor Veselovskii, Joe Comer, Ruei-Fong Lin/UMBC, Gerry McIntire/Raytheon owledgement: Interdisciplinary Research, Jim Dodge, NASA/HQ
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NASA/GSFC Scanning Raman Lidar measurements of water vapor and clouds during IHOP
NASA/GSFC Scanning Raman Lidar measurements of water vapor and clouds during IHOP. David N. Whiteman/NASA-GSFC, Belay Demoz/UMBC Paolo Di Girolamo/Univ. of Basilicata, Igor Veselovskii, Joe Comer, Ruei-Fong Lin/UMBC, Gerry McIntire/Raytheon. - PowerPoint PPT Presentation
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NASA/GSFC Scanning Raman Lidar measurements of water vapor and
clouds during IHOP
David N. Whiteman/NASA-GSFC, Belay Demoz/UMBC
Paolo Di Girolamo/Univ. of Basilicata, Igor Veselovskii, Joe Comer, Ruei-Fong Lin/UMBC, Gerry McIntire/Raytheon
Acknowledgement: Interdisciplinary Research, Jim Dodge, NASA/HQ
OutlineOutline
Scanning Raman Lidar (SRL)– Extensive system modifications prior to IHOP
Error characterization– May 22 dryline event
Measurement example – June 3-4 bore
June 19-20 – Bore case– Cirrus cloud modeling study
Scanning Raman LidarScanning Raman Lidar Telescopes: 0.76 and 0.25 m Nd:YAG (9W @ 355 nm) Windows 12 channel AD/PC IHOP Accomplishments
– >200 hours – Factor of 10 increase in water vapor
signal High quality daytime measurements
– Aerosol depolarization Cirrus cloud studies
– RR Temperature (DiGirolamo et. al.)
Demonstration of eye-safe concept– Liquid water
Cloud droplet retrieval studies
Water Vapor Mixing Ratio PrecisionWater Vapor Mixing Ratio Precision
(Dryline May 22, 2002 - see Demoz et. al.)(Dryline May 22, 2002 - see Demoz et. al.)
• Full Resolution (1 minute, 30 meters)• Less than 10% to beyond 2 km.
• As Distributed (2 min, 60-210 meters)• day <10% in BL• night <2% in BL, <10% to 6km
Recent ground-based measurements validate the RASL system modeling - Appl Opt., 40, No. 3, 375-390 (2001)
• water vapor, aerosol backscatter/extinction/depolarization, cloud liquid water• 10 km flight altitude• 10 second nighttime, 2 minute daytime profiles• <10% random error throughout profile, <5% in BL
Preliminary release of all priority water vapor data– Final release awaiting IHOP specific calibration
Data distributed to 6 km – Higher altitude data awaiting correction for temperature
dependence of water vapor spectrum
Aerosol datasets require extra attention– Correction for finite filter width and temperature
dependence of rotational Raman scattering– Depolarization calibration
June 19-20, 2002June 19-20, 2002Thunderstorm outflow caseThunderstorm outflow case
Storm Motion
Anvil/Cirrus outflow
Density/Bore wave
Falling ice?
Wave propagation?
UT humidification
June 19-20 Bore June 19-20 Bore (See also Flamant et. al.)(See also Flamant et. al.)
Evidence of wave action in several locationsDay Night
Upper Troposphere Humidification and Upper Troposphere Humidification and Cirrus Cloud EvolutionCirrus Cloud Evolution
Theta
Sequence of RH with respect to ice up to 12 km
Cirrus evolution modeling case. Particle size and ice water content coming…
Comparison of Measurements and ModelingComparison of Measurements and Modeling
Model inputs: theta, RHi, P, Size Distribution for each grid box and W (uniform vertical wind for the entire air column). Size and IWC estimates from lidar
coming…
Conclusions and the FutureConclusions and the Future Working hypothesis of waves on June 20
– Mechanical lift up to 6 km– Waves in cirrus clouds induced by shear
GLOW and SRL Scorer calculations
Continue cirrus cloud modeling comparison– Extend the time domain of the model– Couple 2-D cloud and mesoscale models– Seeding and source of wave energy for lower cirrus cloud layer
Simulate wave motion and study effects on microphysics
IHOP Data processing– Final release of water vapor data
IHOP specific water vapor calibration– Aerosol and liquid water analysis
SRL– Automated and eye-safe– Repackage in c-tainer
Oscillations in the lower cirrus layerOscillations in the lower cirrus layer